MHD stability studies in reversed shear plasmas in TFTR

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MHD phenomena in reversed shear plasmas in TFTR are described during each of the three phases of the evolution of these discharges: the current ramp, high power neutral beam heating and after the beam power has been reduced. Theoretical analysis of discharges which disrupted in the high-{beta} phase indicates that the {beta} - limit is set by the ideal n = 1 infernal/kink mode. The mode structure of the disruption precursor reconstructed from the electron temperature data compares favorably with the predicted displacement vector from the ideal MHD model. In contrast, disruptions during the early and late phases are due ... continued below

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12 p.

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Manickam, J.; Fredrickson, E. & Chang, Z. December 31, 1996.

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Description

MHD phenomena in reversed shear plasmas in TFTR are described during each of the three phases of the evolution of these discharges: the current ramp, high power neutral beam heating and after the beam power has been reduced. Theoretical analysis of discharges which disrupted in the high-{beta} phase indicates that the {beta} - limit is set by the ideal n = 1 infernal/kink mode. The mode structure of the disruption precursor reconstructed from the electron temperature data compares favorably with the predicted displacement vector from the ideal MHD model. In contrast, disruptions during the early and late phases are due to resistive instabilities, double tearing modes coupled to high-m edge modes. The resistive interchange mode, predicted to be unstable in reversed shear plasmas, is not seen in the experiment. Neo-classical tearing mode theory is shown to describe the non-disruptive MHD phenomena. A nonlinear resistive MHD simulation reproduces off-axis sawtooth-like crashes during the post-beam phase. The dependence of the {beta}-limit on the pressure peakedness and q{sub min} is discussed, showing a path to stable higher-{beta} regimes.

Physical Description

12 p.

Notes

INIS; OSTI as DE97005297

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  • 16. International Atomic Energy Agency (IAEA) international conference on plasma physics and controlled nuclear fusion research, Montreal (Canada), 7-11 Oct 1996

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  • Other: DE97005297
  • Report No.: PPPL-CFP--3641
  • Report No.: IAEA-CN--64/A5-2;CONF-961005--27
  • Grant Number: AC02-76CH03073
  • Office of Scientific & Technical Information Report Number: 519124
  • Archival Resource Key: ark:/67531/metadc696342

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  • December 31, 1996

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  • Aug. 14, 2015, 8:43 a.m.

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  • Aug. 4, 2016, 7:12 p.m.

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Manickam, J.; Fredrickson, E. & Chang, Z. MHD stability studies in reversed shear plasmas in TFTR, article, December 31, 1996; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc696342/: accessed August 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.